"The Tour Divide is an annual mountain biking race traversing the length of the Rocky Mountains, from Canada to the Mexican border. Following the 2,745-mile (4,418 km) Great Divide Mountain Bike Route, it is an ultra-distance cycling race that is an extreme test of endurance, self-reliance and mental toughness. The race format is strictly self-supported, and it is not a stage race the clock runs continuously from the start until riders cross the finish line, more than two weeks later."